Loading unit detection assembly and surgical device for use therewith

ABSTRACT

The present disclosure relates to hand held powered surgical devices, loading unit detection assemblies, surgical adapters and/or adapter assemblies for use between and for interconnecting the powered surgical device or handle assembly and an end effector for clamping, cutting, stapling and/or sealing tissue.

CROSS REFERENCE TO RELATED APPLICATION

The present application claims the benefit of and priority to U.S. Provisional Application Ser. No. 61/654,197, filed on Jun. 1, 2012, the entire contents of which are incorporated herein by reference.

BACKGROUND

1. Technical Field

The present disclosure relates to surgical devices and/or systems, loading unit detection assemblies, surgical adapters and their methods of use. More specifically, the present disclosure relates to hand held powered surgical devices, loading unit detection assemblies, surgical adapters and/or adapter assemblies for use between and for interconnecting the powered surgical device or handle assembly and an end effector for clamping, cutting, stapling and/or sealing tissue.

2. Background of Related Art

One type of surgical device is a linear clamping, cutting and stapling device. Such a device may be employed in a surgical procedure to resect a cancerous or anomalous tissue from a gastro-intestinal tract. Conventional linear clamping, cutting and stapling instruments include a pistol grip-styled structure having an elongated shaft and distal portion. The distal portion includes a pair of scissors-styled gripping elements, which clamp the open ends of the colon closed. In this device, one of the two scissors-styled gripping elements, such as the anvil portion, moves or pivots relative to the overall structure, whereas the other gripping element remains fixed relative to the overall structure. The actuation of this scissoring device (the pivoting of the anvil portion) is controlled by a grip trigger maintained in the handle.

In addition to the scissoring device, the distal portion also includes a stapling mechanism. The fixed gripping element of the scissoring mechanism includes a staple cartridge receiving region and a mechanism for driving the staples up through the clamped end of the tissue against the anvil portion, thereby sealing the previously opened end. The scissoring elements may be integrally formed with the shaft or may be detachable such that various scissoring and stapling elements may be interchangeable.

A number of surgical device manufacturers have developed product lines with proprietary drive systems for operating and/or manipulating the surgical device. In many instances the surgical devices include a handle assembly, which is reusable, and a disposable end effector or the like that is selectively connected to the handle assembly prior to use and then disconnected from the end effector following use in order to be disposed of or in some instances sterilized for re-use.

Many of the existing end effectors for use with many of the existing surgical devices and/or handle assemblies are driven by a linear force. For examples, end effectors for performing endo-gastrointestinal anastomosis procedures, end-to-end anastomosis procedures and transverse anastomosis procedures, each typically require a linear driving force in order to be operated. As such, these end effectors are not compatible with surgical devices and/or handle assemblies that use a rotary motion to deliver power or the like.

In order to make the linear driven end effectors compatible with surgical devices and/or handle assemblies that use a rotary motion to deliver power, a need exists for adapters and/or adapter assemblies to interface between and interconnect the linear driven end effectors with the rotary driven surgical devices and/or handle assemblies. Additionally, handle assemblies are generally capable of being actuated (e.g., to advance a firing rod and/or an articulation lever) before the end effector is probably engaged with such an adapter. It would therefore be helpful to provide a system that would prevent, substantially prevent or hinder a handle assembly from being at least partially actuated prior to proper engagement between an endoscopic portion of the surgical device (e.g., an adapter) an end effector or loading unit.

SUMMARY

The present disclosure relates to hand held powered surgical devices, loading unit detection assemblies, surgical adapters and/or adapter assemblies for use between and for interconnecting the powered surgical device or handle assembly and an end effector for clamping, cutting, stapling and/or sealing tissue.

According to an aspect of the present disclosure, a surgical device is provided and includes a device housing defining a connecting portion for selectively connecting with an adapter assembly; at least one drive motor supported in the device housing and being configured to rotate at least one drive shaft; a battery disposed in electrical communication with the at least one drive motor; and a circuit board disposed within the housing for controlling power delivered from the battery to the at least one drive motor; a loading unit configured to perform at least one function; an adapter assembly for selectively interconnecting the loading unit and the device housing; and a loading unit detection assembly disposed in mechanical cooperation with the adapter assembly. The loading unit detection assembly includes a detection link configured to be engaged by the loading unit, the detection link being longitudinally translatable with respect to the loading unit; a switch pin disposed in mechanical cooperation with the detection link, such that longitudinal translation of the detection link results in a corresponding longitudinal translation of the switch pin; and a switch button disposed in mechanical cooperation with the adapter assembly. In use, a predetermined amount of mechanical engagement between the loading unit and the loading unit detection assembly causes proximal translation of the detection link and causes the switch pin to move proximally into contact with the switch button, and wherein a predetermined amount of force exerted by the switch pin against the switch button activates the switch button, which electronically communicates with a portion of the device housing to permit actuation of the at least one drive motor.

A distal end of the detection link may include a camming surface for engaging a retaining lug of the loading unit.

The surgical device may further include a switch link disposed between the switch pin and the detection link, the switch pin being longitudinally translatable with respect to the switch link. The switch link may be rotatable with respect to the detection link.

The switch button may be at least partially housed by a switch housing.

The surgical device may further include a first biasing element disposed coaxially with switch pin, the first biasing element being disposed between a proximal portion of the switch link and an enlarged diameter portion of the switch pin. The switch button may be at least partially housed by a switch housing, and wherein the loading unit detection assembly further comprises a retraction pin disposed at least partially between the switch housing and a portion of the switch link, a second biasing element being disposed coaxially with the retraction pin and configured to exert a distal force against the switch link.

The second biasing element may be configured to begin to compress prior to the first biasing element beginning to compress.

The first biasing element may not begin to compress until contact is made between the switch pin and the switch button.

The retraction pin may be longitudinally translatable with respect to the switch link.

The switch pin may be longitudinally translatable with respect to the switch link.

According to another aspect of the present disclosure, a loading unit detection assembly is provided for use with a surgical device configured for selective engagement with a loading unit. The loading unit detection assembly includes a detection link configured to be engaged by a loading unit; and a switch button disposed proximally of the detection link. In use, engagement between the loading unit and the loading unit detection assembly causes the detection link to proximally translate with respect to the loading unit and causes the switch button to become engaged, and engagement of the switch button causes an electronic communication with a portion of the surgical device to permit actuation thereof.

The loading unit detection assembly may further comprise a switch pin disposed in mechanical cooperation with the detection link and adjacent the switch button, and may further comprise a switch link disposed between the switch pin and the detection link, the switch pin being longitudinally translatable with respect to the switch link.

A distal end of the detection link may include a camming surface for engaging a retaining lug of the loading unit.

The switch link may be rotatable with respect to the detection link.

The loading unit detection assembly may further comprise a first biasing element disposed coaxially with switch pin, the first biasing element being disposed between a proximal portion of the switch link and an enlarged diameter portion of the switch pin.

The switch button may be at least partially housed by a switch housing. The loading unit detection assembly may further comprise a retraction pin disposed at least partially between the switch housing and a portion of the switch link, and may further comprise a second biasing element disposed coaxially with the retraction pin and configured to exert a distal force against the switch link.

The second biasing element may be configured to begin to compress prior to the first biasing element beginning to compress.

The first biasing element may not begin to compress until contact is made between the switch pin and the switch button.

The retraction pin may be longitudinally translatable with respect to the switch link.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present disclosure are described herein with reference to the accompanying drawings, wherein:

FIG. 1 is a perspective view, with parts separated, of a surgical device and adapter, in accordance with an embodiment of the present disclosure, illustrating a connection thereof with an end effector;

FIG. 2 is a perspective view of the surgical device of FIG. 1;

FIG. 3 is a perspective view, with parts separated, of the surgical device of FIGS.

1 and 2;

FIG. 4 is a perspective view of a battery for use in the surgical device of FIGS. 1-3;

FIG. 5 is a perspective view of the surgical device of FIGS. 1-3, with a housing thereof removed;

FIG. 6 is a perspective view of the connecting ends of each of the surgical device and the adapter, illustrating a connection therebetween;

FIG. 7 is a cross-sectional view of the surgical device of FIGS. 1-3, as taken through 7-7 of FIG. 2;

FIG. 8 is a cross-sectional view of the surgical device of FIGS. 1-3, as taken through 8-8 of FIG. 2;

FIG. 9 is a perspective view, with parts separated, of a trigger housing of the surgical device of FIGS. 1-3;

FIG. 10 is a perspective view of the adapter of FIG. 1;

FIG. 11 is a perspective view of an adapter assembly including a loading unit detection assembly in accordance with the present disclosure;

FIGS. 12 and 13 are perspective views of a proximal portion of the adapter assembly;

FIGS. 14 and 15 are perspective views of the loading unit detection assembly with various parts of the adapter assembly omitted for clarity;

FIG. 16 is a perspective view of the loading unit detection assembly with a housing thereof omitted for clarity;

FIGS. 17 and 18 are functional, perspective views of a distal portion of the adapter and a proximal portion of the loading unit, prior to, and after engagement therebetween;

FIG. 19 is a cross-sectional view of the adapter, as taken through 19-19 of FIG.

10;

FIG. 20 is an enlarged view of the indicated area of detail of FIG. 19;

FIG. 21 is an enlarged view of the indicated area of detail of FIG. 19;

FIG. 22 is a perspective view, with parts separated, of an exemplary end effector for use with the surgical device and the adapter of the present disclosure; and

FIG. 23 is a schematic illustration of the outputs to the LEDs; selection of motor (to select clamping/cutting, rotation or articulation); and selection of the drive motors to perform a function selected.

DETAILED DESCRIPTION OF EMBODIMENTS

Embodiments of the presently disclosed surgical devices, adapter assemblies, and loading unit detection assemblies for surgical devices and/or handle assemblies are described in detail with reference to the drawings, in which like reference numerals designate identical or corresponding elements in each of the several views. As used herein the term “distal” refers to that portion of the adapter assembly or surgical device, or component thereof, farther from the user, while the term “proximal” refers to that portion of the adapter assembly or surgical device, or component thereof, closer to the user.

A surgical device, in accordance with an embodiment of the present disclosure, is generally designated as 100, and is in the form of a powered hand held electromechanical instrument configured for selective attachment thereto of a plurality of different end effectors that are each configured for actuation and manipulation by the powered hand held electromechanical surgical instrument.

As illustrated in FIG. 1, surgical device 100 is configured for selective connection with an adapter 200, and, in turn, adapter 200 is configured for selective connection with a loading unit 300 (e.g., an end effector, multiple- or single-use loading unit).

As illustrated in FIGS. 1-3, surgical device 100 includes a handle housing 102 having a lower housing portion 104, an intermediate housing portion 106 extending from and/or supported on lower housing portion 104, and an upper housing portion 108 extending from and/or supported on intermediate housing portion 106. Intermediate housing portion 106 and upper housing portion 108 are separated into a distal half-section 110 a that is integrally formed with and extending from the lower portion 104, and a proximal half-section 110 b connectable to distal half-section 110 a by a plurality of fasteners. When joined, distal and proximal half-sections 110 a, 110 b define a handle housing 102 having a cavity 102 a therein in which a circuit board 150 and a drive mechanism 160 is situated.

Distal and proximal half-sections 110 a, 110 b are divided along a plane that traverses a longitudinal axis “X” of upper housing portion 108, as seen in FIG. 3.

Handle housing 102 includes a gasket 112 extending completely around a rim of distal half-section and/or proximal half-section 110 a, 110 b and being interposed between distal half-section 110 a and proximal half-section 110 b. Gasket 112 seals the perimeter of distal half-section 110 a and proximal half-section 110 b. Gasket 112 functions to establish an air-tight seal between distal half-section 110 a and proximal half-section 110 b such that circuit board 150 and drive mechanism 160 are protected from sterilization and/or cleaning procedures.

In this manner, the cavity 102 a of handle housing 102 is sealed along the perimeter of distal half-section 110 a and proximal half-section 110 b yet is configured to enable easier, more efficient assembly of circuit board 150 and a drive mechanism 160 in handle housing 102.

Intermediate housing portion 106 of handle housing 102 provides a housing in which circuit board 150 is situated. Circuit board 150 is configured to control the various operations of surgical device 100, as will be set forth in additional detail below.

Lower housing portion 104 of surgical device 100 defines an aperture (not shown) formed in an upper surface thereof and which is located beneath or within intermediate housing portion 106. The aperture of lower housing portion 104 provides a passage through which wires 152 pass to electrically interconnect electrical components (a battery 156, as illustrated in FIG. 4, a circuit board 154, as illustrated in FIG. 3, etc.) situated in lower housing portion 104 with electrical components (circuit board 150, drive mechanism 160, etc.) situated in intermediate housing portion 106 and/or upper housing portion 108.

Handle housing 102 includes a gasket 103 disposed within the aperture of lower housing portion 104 (not shown) thereby plugging or sealing the aperture of lower housing portion 104 while allowing wires 152 to pass therethrough. Gasket 103 functions to establish an air-tight seal between lower housing portion 106 and intermediate housing portion 108 such that circuit board 150 and drive mechanism 160 are protected from sterilization and/or cleaning procedures.

As shown, lower housing portion 104 of handle housing 102 provides a housing in which a rechargeable battery 156, is removably situated. Battery 156 is configured to supply power to any of the electrical components of surgical device 100. Lower housing portion 104 defines a cavity (not shown) into which battery 156 is inserted. Lower housing portion 104 includes a door 105 pivotally connected thereto for closing cavity of lower housing portion 104 and retaining battery 156 therein.

With reference to FIGS. 3 and 5, distal half-section 110 a of upper housing portion 108 defines a nose or connecting portion 108 a. A nose cone 114 is supported on nose portion 108 a of upper housing portion 108. Nose cone 114 is fabricated from a transparent material. An illumination member 116 is disposed within nose cone 114 such that illumination member 116 is visible therethrough. Illumination member 116 is in the form of a light emitting diode printed circuit board (LED PCB). Illumination member 116 is configured to illuminate multiple colors with a specific color pattern being associated with a unique discrete event.

Upper housing portion 108 of handle housing 102 provides a housing in which drive mechanism 160 is situated. As illustrated in FIG. 5, drive mechanism 160 is configured to drive shafts and/or gear components in order to perform the various operations of surgical device 100. In particular, drive mechanism 160 is configured to drive shafts and/or gear components in order to selectively move tool assembly 304 of loading unit 300 (see FIGS. 1 and 22) relative to proximal body portion 302 of loading unit 300, to rotate loading unit 300 about a longitudinal axis “X” (see FIG. 3) relative to handle housing 102, to move anvil assembly 306 relative to cartridge assembly 308 of loading unit 300, and/or to fire a stapling and cutting cartridge within cartridge assembly 308 of loading unit 300.

The drive mechanism 160 includes a selector gearbox assembly 162 that is located immediately proximal relative to adapter 200. Proximal to the selector gearbox assembly 162 is a function selection module 163 having a first motor 164 that functions to selectively move gear elements within the selector gearbox assembly 162 into engagement with an input drive component 165 having a second motor 166.

As illustrated in FIGS. 1-4, and as mentioned above, distal half-section 110 a of upper housing portion 108 defines a connecting portion 108 a configured to accept a corresponding drive coupling assembly 210 of adapter 200.

As illustrated in FIGS. 6-8, connecting portion 108 a of surgical device 100 has a cylindrical recess 108 b that receives a drive coupling assembly 210 of adapter 200 when adapter 200 is mated to surgical device 100. Connecting portion 108 a houses three rotatable drive connectors 118, 120, 122.

When adapter 200 is mated to surgical device 100, each of rotatable drive connectors 118, 120, 122 of surgical device 100 couples with a corresponding rotatable connector sleeve 218, 220, 222 of adapter 200. (see FIG. 6). In this regard, the interface between corresponding first drive connector 118 and first connector sleeve 218, the interface between corresponding second drive connector 120 and second connector sleeve 220, and the interface between corresponding third drive connector 122 and third connector sleeve 222 are keyed such that rotation of each of drive connectors 118, 120, 122 of surgical device 100 causes a corresponding rotation of the corresponding connector sleeve 218, 220, 222 of adapter 200.

The mating of drive connectors 118, 120, 122 of surgical device 100 with connector sleeves 218, 220, 222 of adapter 200 allows rotational forces to be independently transmitted via each of the three respective connector interfaces. The drive connectors 118, 120, 122 of surgical device 100 are configured to be independently rotated by drive mechanism 160. In this regard, the function selection module 163 of drive mechanism 160 selects which drive connector or connectors 118, 120, 122 of surgical device 100 is to be driven by the input drive component 165 of drive mechanism 160.

Since each of drive connectors 118, 120, 122 of surgical device 100 has a keyed and/or substantially non-rotatable interface with respective connector sleeves 218, 220, 222 of adapter 200, when adapter 200 is coupled to surgical device 100, rotational force(s) are selectively transferred from drive mechanism 160 of surgical device 100 to adapter 200.

The selective rotation of drive connector(s) 118, 120 and/or 122 of surgical device 100 allows surgical device 100 to selectively actuate different functions of loading unit 300. For example, selective and independent rotation of first drive connector 118 of surgical device 100 corresponds to the selective and independent opening and closing of tool assembly 304 of loading unit 300, and driving of a stapling/cutting component of tool assembly 304 of loading unit 300. As an additional example, the selective and independent rotation of second drive connector 120 of surgical device 100 corresponds to the selective and independent articulation of tool assembly 304 of loading unit 300 transverse to longitudinal axis “X” (see FIG. 3). Additionally, for instance, the selective and independent rotation of third drive connector 122 of surgical device 100 corresponds to the selective and independent rotation of loading unit 300 about longitudinal axis “X” (see FIG. 3) relative to handle housing 102 of surgical device 100.

As mentioned above and as illustrated in FIGS. 5 and 8, drive mechanism 160 includes a selector gearbox assembly 162; a function selection module 163, located proximal to the selector gearbox assembly 162, that functions to selectively move gear elements within the selector gearbox assembly 162 into engagement with second motor 166. Thus, drive mechanism 160 selectively drives one of drive connectors 118, 120, 122 of surgical device 100 at a given time.

As illustrated in FIGS. 1-3 and FIG. 9, handle housing 102 supports a trigger housing 107 on a distal surface or side of intermediate housing portion 108. Trigger housing 107, in cooperation with intermediate housing portion 108, supports a pair of finger-actuated control buttons 124, 126 and rocker devices 128, 130. In particular, trigger housing 107 defines an upper aperture 124 a for slidably receiving a first control button 124, and a lower aperture 126 b for slidably receiving a second control button 126.

Each one of the control buttons 124, 126 and rocker devices 128, 130 includes a respective magnet (not shown) that is moved by the actuation of an operator. In addition, circuit board 150 includes, for each one of the control buttons 124, 126 and rocker devices 128, 130, respective Hall-effect switches 150 a-150 d that are actuated by the movement of the magnets in the control buttons 124, 126 and rocker devices 128, 130. In particular, located immediately proximal to the control button 124 is a first Hall-effect switch 150 a (see FIGS. 3 and 7) that is actuated upon the movement of a magnet within the control button 124 upon the operator actuating control button 124. The actuation of first Hall-effect switch 150 a, corresponding to control button 124, causes circuit board 150 to provide appropriate signals to function selection module 163 and input drive component 165 of the drive mechanism 160 to close a tool assembly 304 of loading unit 300 and/or to fire a stapling/cutting cartridge within tool assembly 304 of loading unit 300.

Also, located immediately proximal to rocker device 128 is a second Hall-effect switch 150 b (see FIGS. 3 and 7) that is actuated upon the movement of a magnet (not shown) within rocker device 128 upon the operator actuating rocker device 128. The actuation of second Hall-effect switch 150 b, corresponding to rocker device 128, causes circuit board 150 to provide appropriate signals to function selection module 163 and input drive component 165 of drive mechanism 160 to articulate tool assembly 304 relative to body portion 302 of loading unit 300. Advantageously, movement of rocker device 128 in a first direction causes tool assembly 304 to articulate relative to body portion 302 in a first direction, while movement of rocker device 128 in an opposite, e.g., second, direction causes tool assembly 304 to articulate relative to body portion 302 in an opposite, e.g., second, direction.

Furthermore, located immediately proximal to control button 126 is a third Hall-effect switch 150 c (see FIGS. 3 and 7) that is actuated upon the movement of a magnet (not shown) within control button 126 upon the operator actuating control button 126. The actuation of third Hall-effect switch 150 c, corresponding to control button 126, causes circuit board 150 to provide appropriate signals to function selection module 163 and input drive component 165 of drive mechanism 160 to open tool assembly 304 of loading unit 300.

In addition, located immediately proximal to rocker device 130 is a fourth Hall-effect switch 150 d (see FIGS. 3 and 7) that is actuated upon the movement of a magnet (not shown) within rocker device 130 upon the operator actuating rocker device 130. The actuation of fourth Hall-effect switch 150 d, corresponding to rocker device 130, causes circuit board 150 to provide appropriate signals to function selection module 163 and input drive component 165 of drive mechanism 160 to rotate loading unit 300 relative to handle housing 102 surgical device 100. Specifically, movement of rocker device 130 in a first direction causes loading unit 300 to rotate relative to handle housing 102 in a first direction, while movement of rocker device 130 in an opposite, e.g., second, direction causes loading unit 300 to rotate relative to handle housing 102 in an opposite, e.g., second, direction.

As seen in FIGS. 1-3, surgical device 100 includes a fire button or safety switch 132 supported between intermediate housing portion 108 and upper housing portion, and situated above trigger housing 107. In use, tool assembly 304 of loading unit 300 is actuated between opened and closed conditions as needed and/or desired. In order to fire loading unit 300, to expel fasteners therefrom when tool assembly 304 of loading unit 300 is in a closed condition, safety switch 132 is depressed thereby instructing surgical device 100 that loading unit 300 is ready to expel fasteners therefrom.

Turning now to FIG. 10, adapter 200 includes a knob housing 202 and an outer tube 206 extending from a distal end of knob housing 202. Knob housing 202 and outer tube 206 are configured and dimensioned to house the components of adapter 200. Outer tube 206 is dimensioned for endoscopic insertion, in particular, that outer tube is passable through a typical trocar port, cannula or the like. Knob housing 202 is dimensioned to not enter the trocar port, cannula of the like. Knob housing 202 is configured and adapted to connect to connecting portion 108 a of upper housing portion 108 of distal half-section 110 a of surgical device 100.

Adapter 200 is configured to convert a rotation of either of drive connectors 120 and 122 of surgical device 100 into axial translation useful for operating a drive assembly 360 and an articulation link 366 of loading unit 300, as illustrated in FIG. 22 and as will be discussed in greater detail below.

Adapter 200 includes a first drive transmitting/converting assembly for interconnecting third rotatable drive connector 122 of surgical device 100 and a first axially translatable drive member 360 of loading unit 300, wherein the first drive transmitting/converting assembly converts and transmits a rotation of third rotatable drive connector 122 of surgical device 100 to an axial translation of the first axially translatable drive assembly 360 of loading unit 300 for firing.

Adapter 200 includes a second drive transmitting/converting assembly for interconnecting second rotatable drive connector 120 of surgical device 100 and a second axially translatable drive member 366 of loading unit 300, wherein the second drive transmitting/converting assembly converts and transmits a rotation of second rotatable drive connector 120 of surgical device 100 to an axial translation of articulation link 366 of loading unit 300 for articulation.

As seen in FIG. 6, adapter 200 includes a pair of electrical contact pins 290 a, 290 b for electrical connection to a corresponding electrical plug 190 a, 190 b disposed in connecting portion 108 a of surgical device 100. Electrical contacts 290 a, 290 b serve to allow for calibration and communication of life-cycle information to circuit board 150 of surgical device 100 via electrical plugs 190 a, 190 b that are electrically connected to circuit board 150. Adapter 200 further includes a circuit board supported in knob housing 202 and which is in electrical communication with electrical contact pins 290 a, 290 b.

When a button of surgical device is activated by the user, the software checks predefined conditions. If conditions are met, the software controls the motors and delivers mechanical drive to the attached surgical stapler, which can then open, close, rotate, articulate or fire depending on the function of the pressed button. The software also provides feedback to the user by turning colored lights on or off in a defined manner to indicate the status of surgical device 100, adapter 200 and/or loading unit 300.

A high level electrical architectural view of the system is shown in FIG. 23 and shows the connections to the various hardware and software interfaces. Inputs from presses of buttons 124, 126 and from motor encoders of the drive shaft are shown on the left side of FIG. 23. The microcontroller contains the device software that operates surgical device 100, adapter 200 and/or loading unit 300. The microcontroller receives inputs from and sends outputs to a MicroLAN, an Ultra ID chip, a Battery ID chip, and Adaptor ID chips. The MicroLAN, the Ultra ID chip, the Battery ID chip, and the Adaptor ID chips control surgical device 100, adapter 200 and/or loading unit 300 as follows:

-   MicroLAN—Serial 1-wire bus communication to read/write system     component ID information. -   Ultra ID chip—identifies surgical device 100 and records usage     information. -   Battery ID chip—identifies the Battery 156 and records usage     information. -   Adaptor ID chip—identifies the type of adapter 200, records the     presence of an end effector 300, and records usage information.

The right side of the schematic illustrated in FIG. 23 indicates outputs to the LEDs; selection of motor (to select clamping/cutting, rotation or articulation); and selection of the drive motors to perform the function selected.

As illustrated in FIGS. 11-21, adapter 200 of surgical device 100 includes a loading unit detection assembly 500. Loading unit detection assembly 500 is configured to prevent actuation of surgical device 100 prior to loading unit 300 being mechanically coupled to a distal end of adapter 200.

Loading unit detection assembly 500 includes a detection link 520, a detection link ring 540, a switch link ring 560, a switch link 580, a switch pin 600, a first biasing element 610, a retraction pin 620, a second biasing element 640, a switch housing 660, a switch button 680, a circuit 700, and pins 720 a, 720 b. Generally, as loading unit 300 is loaded/engaged with adapter 200, a retaining lug 301 of loading unit 300 cams detection link 520 proximally, thus causing proximal translation of switch link 580 and switch pin 600, such that switch pin 600 contacts switch button 680. Upon contact between switch pin 600 and switch button 680, circuit 700 and pins 720 a, 720 b communicate to surgical device 100 that loading unit 300 is engaged with adapter 200, and thus permits actuation of surgical device.

With reference to FIGS. 11-16, 19 and 21, detection link 520 is an elongated member that extends between loading unit 300 and a knob housing 202 of adapter 200. A distal portion 520 a of detection link 520 includes a camming surface 522 configured for engagement with retaining lug 301 of loading unit 300, as discussed below. A proximal portion 520 b of detection link 520 is mechanically coupled to detection link ring 540. In the illustrated embodiment, detection link ring 540 forms a complete ring and encircles portions of adapter 200. Additionally, in the illustrated embodiment, detection link 520 is disposed adjacent an outer radial edge of detection link ring 540. It is also envisioned that detection link 520 is radially aligned with a portion of detection link ring 540 and/or is monolithically formed with detection link ring 540. Further, detection link ring 540 is rotatable about axis A-A with respect to a proximal portion 204 of adapter 200, e.g., in response to rotation of knob housing 202.

With continued reference to FIGS. 11-16, 19 and 21, switch link ring 560 is disposed proximally adjacent detection link ring 540. It is envisioned that switch link ring 560 is not capable of being rotated about axis A-A with respect to proximal portion 204 of adapter 200. As such, detection link ring 540 is rotatable with respect to switch link ring 560. In the illustrated embodiment, switch link ring 560 forms a complete ring and encircles portion of adapter 200. A distal portion 580 a of switch link 580 is shown being integrally formed with switch link ring 560, and extending proximally therefrom. A proximal portion 580 b of switch link 580 is connected to (e.g., integrally formed with) a switch finger 590. As shown, switch finger 590 extends substantially perpendicularly from switch link 580.

With particular reference to FIGS. 14-16 and 21, switch pin 600 extends proximally from switch finger 590 and is substantially parallel to switch link 580. A distal portion 600 a of switch pin 600 extends distally through a slot 592 in switch finger 590. The perimeter of at least a portion of switch pin 600 is smaller than a perimeter of at least a portion of slot 592, thus allowing distal portion 600 a of switch pin 600 to move through slot 592. A proximal portion 600 b of switch pin 600 extends into switch housing 620 such that switch pin 600 is adjacent switch button 680. As discussed below, a proximal face 601 (see FIG. 16) of switch pin 600 is movable into contact with switch button 680. First biasing element 610 is disposed coaxially around a portion of switch pin 600. More particularly, a distal end 610 a of first biasing element 610 is disposed in contact with a proximal face 590 a of switch finger 590 (FIG. 16), and a proximal end 610 b of first biasing element 610, which is disposed within housing 660, is disposed in contact with a distal face of enlarged-diameter proximal portion 600 b of switch pin (see FIG. 16).

With reference to FIGS. 14, 15 and 21, retraction pin 620 extends proximally from switch finger 590 and is substantially parallel to switch link 580. A distal portion 620 a of retraction pin 620 extends through a hole 594 (FIG. 16) in switch finger 590. The perimeter of at least a portion of retraction pin 620 is smaller than the perimeter of hole 594, thus allowing distal portion 620 a of retraction pin 620 to move through hole 594. A proximal portion 620 b of retraction pin 620 abuts distal face 660 a of switch housing 660. Additionally, in the illustrated embodiment, proximal portion 620 b of retraction pin 620 includes an enlarged diameter, with respect to distal portion 620 a of retraction pin 620. Second biasing element 640 is disposed coaxially around a portion of retraction pin 620. More particularly, a distal end 640 a of second biasing element 640 is disposed in contact with proximal face 590 a of switch finger 590 (FIG. 16), and proximal end 640 b of second biasing element 640 is disposed in contact with a distal face of enlarged-diameter proximal portion 620 b of retraction pin 620.

With reference to FIGS. 15, 16 and 21, circuit 700 is disposed adjacent switch button 680 and is shown on a proximal face of switch housing 660. Circuit 700 is in electrical communication with switch button 680 and with pins 720 a, 720 b, which extend proximally from a portion of switch housing 660. Circuit 700 electronically communicates (e.g., via pins 720 a, 720 b) the condition of switch button 680 (i.e., in contact or not in contact with switch pin 600) to circuit board 150 of surgical device 100. When switch button 680 is not in contact with switch pin 600 (i.e., when loading unit 300 is not engaged (or not properly engaged) with adapter 200, surgical device electronically prevented from be actuated. When switch button 680 is in contact with switch pin 600 (i.e. when loading unit 300 is properly engaged with adapter 200), actuation of surgical device is electronically permitted.

In operation, and with particular reference to FIGS. 17, 18 and 20, when a user approximates loading unit 300 with adapter assembly 200, retaining lug 301 enters an opening 231 in adapter 200, and flag 303 of loading unit 300 is positioned adjacent a slot 272 in drive bar 258 of adapter 200. Next, the user rotates loading unit 300 with respect to adapter 200 (in the general direction of arrow “A” in FIGS. 17 and 18) to mechanically couple loading unit 300 and adapter 200. Upon rotation, flag 303 enters slot 272, and causes retaining lug 301 to contact a camming surface 522 of detection link 520. Engagement between retaining lug 301 and camming surface 522 causes detection link 520 to move proximally in the general direction of arrow “B” in FIG. 18.

As detection link 520 moves proximally, detection link ring 540 also moves proximally. Regardless of the radial position of detection link 520 and detection link ring 540 (FIG. 16), proximal movement of detection link ring 540 causes proximal movement of switch link ring 560, because detection link ring 540 and switch link ring 560 abut each other along 360°. As switch link ring 560 moves proximally, switch link 580 and switch finger 590 also translate proximally against the bias of second biasing element 640. (Prior to engagement between switch pin 600 and switch button 680, first biasing element 610 does not provide any distal force against switch finger 590 because there is no force acting against proximal face 601 of switch pin 600.) Continued rotation of loading unit 300 with respect to adapter 200, retaining lug 301 continues to cam against camming surface 522, thus causing detection link 520 to move farther proximally. Farther proximal movement of detection link 520, and thus switch link 590 and switch pin 600 causes proximal face 601 of switch pin 600 to contact switch button 680. As discussed above, when switch pin 600 is in sufficient contact with switch button 680 (e.g., a predetermined amount of compression of switch button 680), an appropriate signal is sent to circuit board 150 of surgical device 100, which permits actuation of surgical device 100.

In addition to permitting actuation of surgical device 100, when switch pin 600 contacts (and/or depresses) switch button 680, first biasing element 610 is engaged and provides a distal force against switch finger 590 of switch link 580. More particularly, switch button 680, which is in contact with switch pin 600, provides a distally-directed force against switch pin 600. Additionally, first biasing element 610 allows the user to ‘over stroke’ loading unit detection assembly 500 to help ensure that there is reliable contact between switch pin 600 and switch button 680. Moreover, first biasing element 610 also allows various parts of loading unit detection assembly 500 to have larger (i.e., less strict) tolerances on lengths of parts, for example, while still ensuring reliable contact between switch pin 600 and switch button 680.

With reference to FIGS. 14 and 21, and as discussed above, second biasing element 640 provides a distally-directed (e.g., retraction) force against switch finger 590. Thus, when loading unit 300 is removed from engagement with adapter 200, retaining lug 301 of loading unit 300 moves out of contact with camming surface 522 of detection link 520, and the distally-directed force provided by second biasing element 640 causes distal movement of switch finger 590, switch link 580, switch link ring 560, detection link ring 540 and detection link 520. Further, distal movement of switch finger 590 causes switch pin 600 to move distally and out of contact with switch button 680. As discussed above, when switch pin 600 is not contacting switch button 680, surgical device 100 is not capable of being actuated. Thus, when loading unit 300 is not engaged with adapter 200, actuation of surgical device 100 is not possible.

With reference to FIGS. 1 and 22, loading unit 300 is configured and dimensioned for endoscopic insertion through a cannula, trocar or the like. In particular, in the embodiment illustrated in FIGS. 1 and 22, loading unit 300 may pass through a cannula or trocar when loading unit 300 is in a closed condition.

Loading unit 300 includes a proximal body portion 302 and a tool assembly 304. Proximal body portion 302 is releasably attached to a distal coupling 230 of adapter 200 and tool assembly 304 is pivotally attached to a distal end of proximal body portion 302. Tool assembly 304 includes an anvil assembly 306 and a cartridge assembly 308. Cartridge assembly 308 is pivotal in relation to anvil assembly 306 and is movable between an open or unclamped position and a closed or clamped position for insertion through a cannula of a trocar. Proximal body portion 302 includes at least a drive assembly 360 and an articulation link 366.

With continued reference to FIG. 22, drive assembly 360 includes a flexible drive beam 364 having a distal end which is secured to a dynamic clamping member 365, and a proximal engagement section 368. Engagement section 368 includes a stepped portion defining a shoulder 370. A proximal end of engagement section 368 includes diametrically opposed inwardly extending fingers 372. Fingers 372 engage a hollow drive member 374 to fixedly secure drive member 374 to the proximal end of beam 364. Drive member 374 defines a proximal porthole 376 which receives connection member 247 of drive tube 246 of first drive converter assembly 240 of adapter 200 when loading unit 300 is attached to distal coupling 230 of adapter 200.

When drive assembly 360 is advanced distally within tool assembly 304, an upper beam of clamping member 365 moves within a channel defined between anvil plate 312 and anvil cover 310 and a lower beam moves over the exterior surface of carrier 316 to close tool assembly 304 and fire staples therefrom.

Proximal body portion 302 of loading unit 300 includes an articulation link 366 having a hooked proximal end 366 a which extends from a proximal end of loading unit 300. Hooked proximal end 366 a of articulation link 366 engages coupling hook 258 c of drive bar 258 of adapter 200 when loading unit 300 is secured to distal housing 232 of adapter 200. When drive bar 258 of adapter 200 is advanced or retracted as described above, articulation link 366 of loading unit 300 is advanced or refracted within loading unit 300 to pivot tool assembly 304 in relation to a distal end of proximal body portion 302.

As illustrated in FIG. 22, cartridge assembly 308 of tool assembly 304 includes a staple cartridge 305 supportable in carrier 316. Staple cartridge 305 defines a central longitudinal slot 305 a, and three linear rows of staple retention slots 305 b positioned on each side of longitudinal slot 305 a. Each of staple retention slots 305 b receives a single staple 307 and a portion of a staple pusher 309. During operation of surgical device 100, drive assembly 360 abuts an actuation sled and pushes actuation sled through cartridge 305. As the actuation sled moves through cartridge 305, cam wedges of the actuation sled sequentially engage staple pushers 309 to move staple pushers 309 vertically within staple retention slots 305 b and sequentially eject a single staple 307 therefrom for formation against anvil plate 312.

Reference may be made to U.S. Patent Publication No. 2009/0314821, filed on Aug. 31, 2009, entitled “TOOL ASSEMBLY FOR A SURGICAL STAPLING DEVICE” for a detailed discussion of the construction and operation of loading unit 300.

It will be understood that various modifications may be made to the embodiments of the presently disclosed adapter assemblies. For example, while the disclosure discusses loading unit detection assembly 500 for use with a surgical device 100 including an adapter 200, it is envisioned and within the scope of the present disclosure that loading unit detection assembly 500 is usable with a surgical device 100 including an elongated endoscopic portion, and which does not include an adapter. Further, loading unit detection assembly 500 is usable with a hand-powered surgical instrument (e.g., a surgical instrument that includes at least one movable handle for actuating the jaw member, firing fasteners, applying electrosurgical energy to tissue, rotating the jaw member, articulation the jaw members, etc. Further still, the battery 156 may be replaced with alternate sources of electrical power such as line voltage (either AC or DC) or a fuel cell. Therefore, the above description should not be construed as limiting, but merely as exemplifications of embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the present disclosure. 

What is claimed is:
 1. A surgical device, comprising: a device housing defining a connecting portion for selectively connecting with an adapter assembly; at least one drive motor supported in the device housing and being configured to rotate at least one drive shaft; a battery disposed in electrical communication with the at least one drive motor; a circuit board disposed within the housing for controlling power delivered from the battery to the at least one drive motor; a loading unit configured to perform at least one function; an adapter assembly for selectively interconnecting the loading unit and the device housing; and a loading unit detection assembly disposed in mechanical cooperation with the adapter assembly, the loading unit detection assembly comprising: a detection link configured to be engaged by the loading unit, the detection link being longitudinally translatable with respect to the loading unit; a switch pin disposed in mechanical cooperation with the detection link, such that longitudinal translation of the detection link results in a corresponding longitudinal translation of the switch pin; and a switch button disposed in mechanical cooperation with the adapter assembly; wherein a predetermined amount of mechanical engagement between the loading unit and the loading unit detection assembly causes proximal translation of the detection link and causes the switch pin to move proximally into contact with the switch button, and wherein a predetermined amount of force exerted by the switch pin against the switch button activates the switch button, which electronically communicates with a portion of the device housing to permit actuation of the at least one drive motor.
 2. The surgical device of claim 1, wherein a distal end of the detection link includes a camming surface for engaging a retaining lug of the loading unit.
 3. The surgical device of claim 1, further comprising a switch link disposed between the switch pin and the detection link, the switch pin being longitudinally translatable with respect to the switch link.
 4. The surgical device of claim 3, wherein the switch link is rotatable with respect to the detection link.
 5. The surgical device of claim 1, wherein the switch button is at least partially housed by a switch housing.
 6. The surgical device of claim 3, further comprising a first biasing element disposed coaxially with switch pin, the first biasing element being disposed between a proximal portion of the switch link and an enlarged diameter portion of the switch pin.
 7. The surgical device of claim 6, wherein the switch button is at least partially housed by a switch housing, and wherein the loading unit detection assembly further comprises a retraction pin disposed at least partially between the switch housing and a portion of the switch link, a second biasing element being disposed coaxially with the retraction pin and configured to exert a distal force against the switch link.
 8. The surgical device of claim 7, where the second biasing element is configured to begin to compress prior to the first biasing element beginning to compress.
 9. The surgical device of claim 6, wherein the first biasing element does not begin to compress until contact is made between the switch pin and the switch button.
 10. The surgical device of claim 7, wherein the retraction pin is longitudinally translatable with respect to the switch link.
 11. The surgical device of claim 10, wherein the switch pin is longitudinally translatable with respect to the switch link.
 12. A loading unit detection assembly for use with a surgical device configured for selective engagement with a loading unit, the loading unit detection assembly comprising: a detection link configured to be engaged by a loading unit; and a switch button disposed proximally of the detection link; wherein engagement between the loading unit and the loading unit detection assembly causes the detection link to proximally translate with respect to the loading unit and causes the switch button to become engaged, and wherein engagement of the switch button causes an electronic communication with a portion of the surgical device to permit actuation thereof.
 13. The loading unit detection assembly of claim 12, further comprising a switch pin disposed in mechanical cooperation with the detection link and adjacent the switch button, and further comprising a switch link disposed between the switch pin and the detection link, the switch pin being longitudinally translatable with respect to the switch link.
 14. The loading unit detection assembly of claim 12, wherein a distal end of the detection link includes a camming surface for engaging a retaining lug of the loading unit.
 15. The loading unit detection assembly of claim 13, wherein the switch link is rotatable with respect to the detection link.
 16. The loading unit detection assembly of claim 13, further comprising a first biasing element disposed coaxially with switch pin, the first biasing element being disposed between a proximal portion of the switch link and an enlarged diameter portion of the switch pin.
 17. The loading unit detection assembly of claim 16, wherein the switch button is at least partially housed by a switch housing, and wherein the loading unit detection assembly further comprises a retraction pin disposed at least partially between the switch housing and a portion of the switch link, and further comprising a second biasing element disposed coaxially with the retraction pin and configured to exert a distal force against the switch link.
 18. The loading unit detection assembly of claim 17, where the second biasing element is configured to begin to compress prior to the first biasing element beginning to compress.
 19. The loading unit detection assembly of claim 16, wherein the first biasing element does not begin to compress until contact is made between the switch pin and the switch button.
 20. The loading unit detection assembly of claim 17, wherein the retraction pin is longitudinally translatable with respect to the switch link. 